So I'll be right up front - I don't know a damn thing about my transmission, especially if it's cable or vacuum or electric...

Here's the problem, it's shifting on RPM but not on throttle position, so going up a hill on the highway is a hell of a problem, and forget about trying to pass someone without a couple miles to get the speed up first.

I did a search through the forum but I don't see anything like this (lots of other problems though). Anybody been through this?

The TVS on the side of passenger side of the IP controls the torque converter lock up.

The TV cable controls the shift points of the other forward gears.

At the rear of the engine on the drivers side tucked below the intake is the TV cable that controls yours shift points. Does this cable have slack in it or not move in and out as you give it throttle?

I would guess the TV cable is WAY out of adjustment because the adjuster is worn out. This cable has to be set correct or you WILL shorten your trany life.

To adjust the TV cable find the black sideways D with a metal tab in the middle at the rear drivers side of the engine, behind the intake and probably under a big harness, follow the steel cable towards the fire wall. Push down with a screw driver on the tab and pull the rear sheathed part of the cable towards the firewall, hold the cable and release the tab. Then open the throttle all the way and you should hear snaps, 2 or 3, as the TV cable self adjusts.

Mark the adjuster and take it for a drive, check the adjuster again to make sure it hasn't slipped forwards, could be worn out, replace it if it has moved again. Simple enough eh.

Ok real quick, the TVS on the passenger side of the IP is wiring, right? I'm looking for the TV cable, but I'm going to have to pull the pressure chamber off the top of the intake to get a decent look back there.

1. It shifts more smoothly at low speeds. Since the shifting had gone bad, the shift from 1-2 in the 50km/h range was really harsh. Seems a lot smoother now.

2. Does not shift under acceleration. Now when I hit the gas to get up to highway speed, I'm not battling for 5 minutes waiting for it to get up to 110.

3. Hitting the gas at speed WILL make it downshift! About damn time...

You're absolutely right though if it slips again I'll be replacing the adjuster.

That being said though, I've been tossing around the idea of building in the reverse valve body and putting in a floor shifter to take advantage of the manual-automatic, then it becomes a moot point. But hell, nothing helps getting through the mud like having that control.

I'd been having the problem with this transmission for a month or so, but not a daily driver just a trail toy so I wasn't worried. Until Sunday afternoon when I was coming up an embankment, wheels started spinning again and the damn thing shifted and I lost all power; crawled out of it eventually though. Straw that broke the camel's back. Next time might just end up being a much more involved project.

So it's good to go now, it's shifting better? If the shifts change again I'd replace it, They don't slip for nothing, they are a bit of a PITA to replace though.

Yes, the electrical bit on the passenger side of the IP is your TPS. You can tune your converter lock up point buy loosing and rotating slightly and road testing, repeat till your happy.

Interesting....... The converter in my truck locks when it goes into 4th, after a second or two. I would really like it to not lock until 55ish. So the adjustment is in the TPS, which way to you twist that sucker to delay the lockup?

good thing you caught that when you did. I've been told a poorly adjusted tv cable can kill a tranny in under 100 miles. if it does it again swap that out fast! $30 part vs tranny rebuild.

would a dash mounted TC lockup switch override the normal hydraulic lockup? i was told by a shop that with the 700r4's you either have hydraulic or manual TC lockup but cant have both. that sound right or did i misunderstand the gentleman?

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.

AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.